Sandpapering-machine.



Patented July 5, 1910.

WITNESSES.-

A TTORNLY.

make and use the same.

.dEoRG-s sivri'rn. or DULUTH, MINNESOTA.

sANnrAPEainG-ivtacm'un ass-n31. 4

Specification of Letters Patent.

Patented July 5, 191 0.

Application filed J'anuary'26, 1909. Serial No. 474 281.

To all whom it may concern:

Be it known that I, GEORGE SMITH, a citizen of the United States, residing at Duluth, in the county of St. Louis and State of. Minnesota, have invented certain new and useful Improvements in SandpaperingMachines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to My invention relates to sandpapering machines, and has for its object the provision of a practical and convenient machine for sandpapering floors.

It consists of the constructions, combinations and arrangements of parts hereinafter describedand claimed. I

In the drawings, Fi ure 1, is a side elevation of the preferred orm of my invention. Fig. 2, is a top plan View of the same. Fig... 3, is a cent-ral transverse section of the same, omitting the power transmission means.

In the drawings, 1, is'a. frame, preferably rectangular in plan, which frame is mount ed on supports of any sui'tableconstruction, as casters 2. Journaled insuitable bearings on said frame are belt wheels 3 and 4, which wheels are engaged by a belt 5, of any suitable material or construction havin its outer face coated with an abrasive of any suitable nature, as sand. The Wheel 3 is rigidly mounted on; a rotatable shaft 3, upon which is also mounted a gear3 which meshes witha pinion 6, mounted on a rotatable shaft 7, upon which shaft 7, is also mounted a belt wheel 8, engaged by a belt 9, which belt 9 also engages the belt wheel 10, which is mounted on the drive shaft 11, forming part of a motor 12, of any suitable construction-but preferably an electric Inotor-ma'ny forms of which are well known to the art and therefore it is not thought necessary to'p'articularly describe the construction of the motor. Mounted on said frame .is-a tiltable shaft 13, extending transversely of the machine and into the space inclosed by said belt 5. Upon one end of said shaft and within said space is mounted-a cradle 14-, adapted to rock longitudinally and transversely on said shaft 13, for a limited distance. Said cradle is preferably securedto said .shaft 13 by a centrally disposed vertically directed bolt 14, extending throu h a tapered aperture 18 in said shaft, and through said cradle. The cradle preferably consists of a central block a and side plates 6 bolted to said central block and extending longitudinally beyond the same at each end, said cradle having a transversely extending slotted aperture 0 formed therein at or near its center, said aperture fitting the shaft 13, closely at its sides but beingenlarged at its ends to permit the cradle to rock transversely on said shaft l3'longitudinall'y thereof. Said shaft is intermediate of its ends, or at its opposite'end as at 13", pivotally supported on said frame' Mounted in suitable bearings on said cradle are two padded presser wheels,15 and 16,- extending into the space inclosed by said belt 5 and adapted in operation to bear upon'the lower loop ofsaid belt and press the same upon the floor or surface to be sandpapered. The pressure of said presser wheels may be regulated by a vertical pistonl7, actuated by an expanding spring-l8, which piston has an eye formed in its lower end for the passage of said shaft 13. Said spring is osition'ed between a fixed collar l7 forme on said piston near its lower end, and a loose collar 17 mounted on. said piston above said .spring' The upper end of said piston extends into a tubular set screw 19 which is internally threadedto engage a threaded aperture in said frame, and is'adaptedto be set more or less forcibly against the upper face of said loose collar so as to depress the same upon said spring and effect the required tension thereof. In order to ra1se said presser wheels out of operative position,

I have provided a vertically directed drawbar 20, extending vertically through said frame and provided at its upper end with a cam lever 21. The lower end of said drawbar is slotted for the passage of saidshaft 13, said slot permitting suflicient -vertical play of the shaft when the drawbar is in lowered position' 'By means of said cam lever and draw-bar,*said shaft 13, together with the cradle and presser wheels supportedthereby may be raised in opposition to the influenceof said spring. The wheel 4,

is an idler, and is preferably mounted on a shaft which is journaled in a journal-box adjustable longitudinally of said frame so thattension may be put on said belt5 'independently of the effect of said presser wheels thereon.

Handle bars X are provided for pushing the machine along the floor.

In operation, the shaft 13 is lowered and thede'sired pressure is imparted to the lower" loop of. the belt 5. The motor is started and{ i the machine is pushed back and forth along the floor.- In case. the floor is uneven, the cradle rocks so as to cause the lower face of the belt 5 to accommodate itself in large measure to the floor levels.

The preferred form of construction described may be altered or modified in various particulars without'" departm'g fro1'n f v the spirit of my invention or from'the s c0 e s of certain of; my cla1ms.- And especla y.

'bination with suitable supp0rts,'of a frame,

" a belt having an-1abrasive-coated outer face,

adapted to 'co'ntactwith a foreign surface to be smoothed thereby, '-means for driving ,said belt, a vertically yielding cradle po's'itioned within'the'space inclosed by said belt; and adapted to rock longitudinally and transversely therein, 'presser wheels rotatably' mounted on said cradle at the opposite ends thereof and adapted to bear upon one.

of said sides of said belt and to ;be rotated j by the same'and meansfor supporting s id.

cradle on said frame. 1

2. In. a sandpapering machine, the

, nationof a frame, a beltliavingan abrasive coated outer face, ada ted to'bear against a foreign surface; to e smoothed thereby,

means for. driving saidlbelt a shaft, a cradle mounted upon one end 0 said shaft and" adapted to rock transversely andlongiti 'di nally thereon and extending infidthefspacet shaft, an

space inclosed by said belt and adapted to hear u on one side of 'said belt and to'be rogthe same, and yielding means for a depressing the -crad1e-support1ng' end of tated said shaft. l.

"3. The combination ofa frame, a belt adapted to .c'ontact with a surface to be .4

smoothed thereby, means for driving said belt, a shaft, a cradle mounted upon one end of said shaft and adapted to rock t'rans- Versely and-longitudinally and extending into a space inc -osed by said belt, presser wheels mounted on. said cradle and extending 'into "-said space and adapted to bear against one face of saidbelt, and means for supporting said shaft from said frame:

4. The" combination of aframe, a vertically rotatable belt adaptedto -contact with an underlying'surface to besmoothed, means I for driving said belt, a shaft extending transversely of said beltjand frame, a cradle mounted on said shaft'and extending into a space inclosed' by said-beltiand adapted to rock longitudinally, resser wheels mounted on sa d cradle and extending-into said spaceand 'adapted to bear a ainst the upper face of thelowen side of saiii rotated thereby,- means'for supporting said shaft from said frame,yielding.means for depressinftheicradle supporting end of said porting endof smashes.

' Intest" ony whereof I hereunto afiix my lg' I WQ l J f IiIQ SBnce of two witnesses. v

"jWitnesse's': inclosed by said belt, .presser 'jw h'eelsfinonnti" ed on said cradle 'and iextendlhg' into the J AMES1T. WATSON,

belt and to be meansffor raising the cradle sup- 

